1 /*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "include/private/SkColorData.h"
9 #include "src/base/SkHalf.h"
10 #include "src/core/SkColorSpacePriv.h"
11 #include "src/core/SkColorSpaceXformSteps.h"
12 #include "src/core/SkConvertPixels.h"
13 #include "src/core/SkImageInfoPriv.h"
14 #include "src/core/SkOpts.h"
15 #include "src/core/SkRasterPipeline.h"
16
rect_memcpy(const SkImageInfo & dstInfo,void * dstPixels,size_t dstRB,const SkImageInfo & srcInfo,const void * srcPixels,size_t srcRB,const SkColorSpaceXformSteps & steps)17 static bool rect_memcpy(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
18 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
19 const SkColorSpaceXformSteps& steps) {
20 // We can copy the pixels when no color type, alpha type, or color space changes.
21 if (dstInfo.colorType() != srcInfo.colorType()) {
22 return false;
23 }
24 if (dstInfo.colorType() != kAlpha_8_SkColorType
25 && steps.flags.mask() != 0b00000) {
26 return false;
27 }
28
29 SkRectMemcpy(dstPixels, dstRB,
30 srcPixels, srcRB, dstInfo.minRowBytes(), dstInfo.height());
31 return true;
32 }
33
swizzle_or_premul(const SkImageInfo & dstInfo,void * dstPixels,size_t dstRB,const SkImageInfo & srcInfo,const void * srcPixels,size_t srcRB,const SkColorSpaceXformSteps & steps)34 static bool swizzle_or_premul(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
35 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
36 const SkColorSpaceXformSteps& steps) {
37 auto is_8888 = [](SkColorType ct) {
38 return ct == kRGBA_8888_SkColorType || ct == kBGRA_8888_SkColorType;
39 };
40 if (!is_8888(dstInfo.colorType()) ||
41 !is_8888(srcInfo.colorType()) ||
42 steps.flags.linearize ||
43 steps.flags.gamut_transform ||
44 steps.flags.unpremul ||
45 steps.flags.encode) {
46 return false;
47 }
48
49 const bool swapRB = dstInfo.colorType() != srcInfo.colorType();
50
51 void (*fn)(uint32_t*, const uint32_t*, int) = nullptr;
52
53 if (steps.flags.premul) {
54 fn = swapRB ? SkOpts::RGBA_to_bgrA
55 : SkOpts::RGBA_to_rgbA;
56 } else {
57 // If we're not swizzling, we ought to have used rect_memcpy().
58 SkASSERT(swapRB);
59 fn = SkOpts::RGBA_to_BGRA;
60 }
61
62 for (int y = 0; y < dstInfo.height(); y++) {
63 fn((uint32_t*)dstPixels, (const uint32_t*)srcPixels, dstInfo.width());
64 dstPixels = SkTAddOffset<void>(dstPixels, dstRB);
65 srcPixels = SkTAddOffset<const void>(srcPixels, srcRB);
66 }
67 return true;
68 }
69
convert_to_alpha8(const SkImageInfo & dstInfo,void * vdst,size_t dstRB,const SkImageInfo & srcInfo,const void * src,size_t srcRB,const SkColorSpaceXformSteps &)70 static bool convert_to_alpha8(const SkImageInfo& dstInfo, void* vdst, size_t dstRB,
71 const SkImageInfo& srcInfo, const void* src, size_t srcRB,
72 const SkColorSpaceXformSteps&) {
73 if (dstInfo.colorType() != kAlpha_8_SkColorType) {
74 return false;
75 }
76 auto dst = (uint8_t*)vdst;
77
78 switch (srcInfo.colorType()) {
79 case kUnknown_SkColorType:
80 case kAlpha_8_SkColorType: {
81 // Unknown should never happen.
82 // Alpha8 should have been handled by rect_memcpy().
83 SkASSERT(false);
84 return false;
85 }
86
87 case kA16_unorm_SkColorType: {
88 auto src16 = (const uint16_t*) src;
89 for (int y = 0; y < srcInfo.height(); y++) {
90 for (int x = 0; x < srcInfo.width(); x++) {
91 dst[x] = src16[x] >> 8;
92 }
93 dst = SkTAddOffset<uint8_t>(dst, dstRB);
94 src16 = SkTAddOffset<const uint16_t>(src16, srcRB);
95 }
96 return true;
97 }
98
99 case kGray_8_SkColorType:
100 case kRGB_565_SkColorType:
101 case kR8G8_unorm_SkColorType:
102 case kR16G16_unorm_SkColorType:
103 case kR16G16_float_SkColorType:
104 case kRGB_888x_SkColorType:
105 case kRGB_101010x_SkColorType:
106 case kBGR_101010x_SkColorType:
107 case kBGR_101010x_XR_SkColorType:
108 case kR8_unorm_SkColorType: {
109 for (int y = 0; y < srcInfo.height(); ++y) {
110 memset(dst, 0xFF, srcInfo.width());
111 dst = SkTAddOffset<uint8_t>(dst, dstRB);
112 }
113 return true;
114 }
115
116 case kARGB_4444_SkColorType: {
117 auto src16 = (const uint16_t*) src;
118 for (int y = 0; y < srcInfo.height(); y++) {
119 for (int x = 0; x < srcInfo.width(); x++) {
120 dst[x] = SkPacked4444ToA32(src16[x]);
121 }
122 dst = SkTAddOffset<uint8_t>(dst, dstRB);
123 src16 = SkTAddOffset<const uint16_t>(src16, srcRB);
124 }
125 return true;
126 }
127
128 case kBGRA_8888_SkColorType:
129 case kRGBA_8888_SkColorType:
130 case kSRGBA_8888_SkColorType: {
131 auto src32 = (const uint32_t*) src;
132 for (int y = 0; y < srcInfo.height(); y++) {
133 for (int x = 0; x < srcInfo.width(); x++) {
134 dst[x] = src32[x] >> 24;
135 }
136 dst = SkTAddOffset<uint8_t>(dst, dstRB);
137 src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
138 }
139 return true;
140 }
141
142 case kRGBA_1010102_SkColorType:
143 case kBGRA_1010102_SkColorType: {
144 auto src32 = (const uint32_t*) src;
145 for (int y = 0; y < srcInfo.height(); y++) {
146 for (int x = 0; x < srcInfo.width(); x++) {
147 dst[x] = (src32[x] >> 30) * 0x55;
148 }
149 dst = SkTAddOffset<uint8_t>(dst, dstRB);
150 src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
151 }
152 return true;
153 }
154
155 case kRGBA_F16Norm_SkColorType:
156 case kRGBA_F16_SkColorType: {
157 auto src64 = (const uint64_t*) src;
158 for (int y = 0; y < srcInfo.height(); y++) {
159 for (int x = 0; x < srcInfo.width(); x++) {
160 dst[x] = (uint8_t) (255.0f * SkHalfToFloat(src64[x] >> 48));
161 }
162 dst = SkTAddOffset<uint8_t>(dst, dstRB);
163 src64 = SkTAddOffset<const uint64_t>(src64, srcRB);
164 }
165 return true;
166 }
167
168 case kRGBA_F32_SkColorType: {
169 auto rgba = (const float*)src;
170 for (int y = 0; y < srcInfo.height(); y++) {
171 for (int x = 0; x < srcInfo.width(); x++) {
172 dst[x] = (uint8_t)(255.0f * rgba[4*x+3]);
173 }
174 dst = SkTAddOffset<uint8_t>(dst, dstRB);
175 rgba = SkTAddOffset<const float>(rgba, srcRB);
176 }
177 return true;
178 }
179
180 case kA16_float_SkColorType: {
181 auto srcF16 = (const uint16_t*) src;
182 for (int y = 0; y < srcInfo.height(); y++) {
183 for (int x = 0; x < srcInfo.width(); x++) {
184 dst[x] = (uint8_t) (255.0f * SkHalfToFloat(srcF16[x]));
185 }
186 dst = SkTAddOffset<uint8_t>(dst, dstRB);
187 srcF16 = SkTAddOffset<const uint16_t>(srcF16, srcRB);
188 }
189 return true;
190 }
191
192 case kR16G16B16A16_unorm_SkColorType: {
193 auto src64 = (const uint64_t*) src;
194 for (int y = 0; y < srcInfo.height(); y++) {
195 for (int x = 0; x < srcInfo.width(); x++) {
196 dst[x] = (src64[x] >> 48) >> 8;
197 }
198 dst = SkTAddOffset<uint8_t>(dst, dstRB);
199 src64 = SkTAddOffset<const uint64_t>(src64, srcRB);
200 }
201 return true;
202 }
203 }
204 return false;
205 }
206
207 // Default: Use the pipeline.
convert_with_pipeline(const SkImageInfo & dstInfo,void * dstRow,int dstStride,const SkImageInfo & srcInfo,const void * srcRow,int srcStride,const SkColorSpaceXformSteps & steps)208 static void convert_with_pipeline(const SkImageInfo& dstInfo, void* dstRow, int dstStride,
209 const SkImageInfo& srcInfo, const void* srcRow, int srcStride,
210 const SkColorSpaceXformSteps& steps) {
211 SkRasterPipeline_MemoryCtx src = { (void*)srcRow, srcStride },
212 dst = { (void*)dstRow, dstStride };
213
214 SkRasterPipeline_<256> pipeline;
215 pipeline.append_load(srcInfo.colorType(), &src);
216 steps.apply(&pipeline);
217 pipeline.append_store(dstInfo.colorType(), &dst);
218 pipeline.run(0,0, srcInfo.width(), srcInfo.height());
219 }
220
SkConvertPixels(const SkImageInfo & dstInfo,void * dstPixels,size_t dstRB,const SkImageInfo & srcInfo,const void * srcPixels,size_t srcRB)221 bool SkConvertPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
222 const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB) {
223 SkASSERT(dstInfo.dimensions() == srcInfo.dimensions());
224 SkASSERT(SkImageInfoValidConversion(dstInfo, srcInfo));
225
226 int srcStride = (int)(srcRB / srcInfo.bytesPerPixel());
227 int dstStride = (int)(dstRB / dstInfo.bytesPerPixel());
228 if ((size_t)srcStride * srcInfo.bytesPerPixel() != srcRB ||
229 (size_t)dstStride * dstInfo.bytesPerPixel() != dstRB) {
230 return false;
231 }
232
233 SkColorSpaceXformSteps steps{srcInfo.colorSpace(), srcInfo.alphaType(),
234 dstInfo.colorSpace(), dstInfo.alphaType()};
235
236 for (auto fn : {rect_memcpy, swizzle_or_premul, convert_to_alpha8}) {
237 if (fn(dstInfo, dstPixels, dstRB, srcInfo, srcPixels, srcRB, steps)) {
238 return true;
239 }
240 }
241 convert_with_pipeline(dstInfo, dstPixels, dstStride, srcInfo, srcPixels, srcStride, steps);
242 return true;
243 }
244